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368 lines
14 KiB
C++
368 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsJSEnvironment_h___
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#define nsJSEnvironment_h___
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#include "nsIScriptContext.h"
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#include "nsIScriptRuntime.h"
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#include "nsCOMPtr.h"
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#include "jsapi.h"
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#include "nsIObserver.h"
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#include "nsIXPCScriptNotify.h"
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#include "prtime.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsScriptNameSpaceManager.h"
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class nsIXPConnectJSObjectHolder;
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class nsJSContext : public nsIScriptContext,
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public nsIXPCScriptNotify
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{
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public:
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nsJSContext(JSRuntime *aRuntime);
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virtual ~nsJSContext();
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSContext,
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nsIScriptContext)
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virtual PRUint32 GetScriptTypeID()
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{ return nsIProgrammingLanguage::JAVASCRIPT; }
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virtual nsresult EvaluateString(const nsAString& aScript,
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void *aScopeObject,
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nsIPrincipal *principal,
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const char *aURL,
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PRUint32 aLineNo,
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PRUint32 aVersion,
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nsAString *aRetValue,
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PRBool* aIsUndefined);
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virtual nsresult EvaluateStringWithValue(const nsAString& aScript,
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void *aScopeObject,
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nsIPrincipal *aPrincipal,
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const char *aURL,
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PRUint32 aLineNo,
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PRUint32 aVersion,
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void* aRetValue,
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PRBool* aIsUndefined);
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virtual nsresult CompileScript(const PRUnichar* aText,
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PRInt32 aTextLength,
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void *aScopeObject,
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nsIPrincipal *principal,
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const char *aURL,
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PRUint32 aLineNo,
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PRUint32 aVersion,
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nsScriptObjectHolder &aScriptObject);
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virtual nsresult ExecuteScript(void* aScriptObject,
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void *aScopeObject,
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nsAString* aRetValue,
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PRBool* aIsUndefined);
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virtual nsresult CompileEventHandler(nsIAtom *aName,
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PRUint32 aArgCount,
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const char** aArgNames,
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const nsAString& aBody,
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const char *aURL, PRUint32 aLineNo,
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PRUint32 aVersion,
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nsScriptObjectHolder &aHandler);
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virtual nsresult CallEventHandler(nsISupports* aTarget, void *aScope,
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void* aHandler,
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nsIArray *argv, nsIVariant **rv);
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virtual nsresult BindCompiledEventHandler(nsISupports *aTarget,
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void *aScope,
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nsIAtom *aName,
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void *aHandler);
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virtual nsresult GetBoundEventHandler(nsISupports* aTarget, void *aScope,
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nsIAtom* aName,
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nsScriptObjectHolder &aHandler);
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virtual nsresult CompileFunction(void* aTarget,
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const nsACString& aName,
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PRUint32 aArgCount,
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const char** aArgArray,
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const nsAString& aBody,
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const char* aURL,
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PRUint32 aLineNo,
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PRUint32 aVersion,
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PRBool aShared,
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void** aFunctionObject);
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virtual void SetDefaultLanguageVersion(PRUint32 aVersion);
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virtual nsIScriptGlobalObject *GetGlobalObject();
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virtual void *GetNativeContext();
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virtual void *GetNativeGlobal();
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virtual nsresult CreateNativeGlobalForInner(
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nsIScriptGlobalObject *aGlobal,
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PRBool aIsChrome,
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void **aNativeGlobal,
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nsISupports **aHolder);
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virtual nsresult ConnectToInner(nsIScriptGlobalObject *aNewInner,
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void *aOuterGlobal);
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virtual nsresult InitContext(nsIScriptGlobalObject *aGlobalObject);
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virtual PRBool IsContextInitialized();
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virtual void FinalizeContext();
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virtual void GC();
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virtual void ScriptEvaluated(PRBool aTerminated);
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virtual nsresult SetTerminationFunction(nsScriptTerminationFunc aFunc,
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nsISupports* aRef);
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virtual PRBool GetScriptsEnabled();
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virtual void SetScriptsEnabled(PRBool aEnabled, PRBool aFireTimeouts);
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virtual nsresult SetProperty(void *aTarget, const char *aPropName, nsISupports *aVal);
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virtual PRBool GetProcessingScriptTag();
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virtual void SetProcessingScriptTag(PRBool aResult);
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virtual void SetGCOnDestruction(PRBool aGCOnDestruction);
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virtual nsresult InitClasses(void *aGlobalObj);
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virtual void ClearScope(void* aGlobalObj, PRBool bClearPolluters);
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virtual void WillInitializeContext();
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virtual void DidInitializeContext();
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virtual void DidSetDocument(nsISupports *aDocdoc, void *aGlobal) {;}
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virtual nsresult Serialize(nsIObjectOutputStream* aStream, void *aScriptObject);
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virtual nsresult Deserialize(nsIObjectInputStream* aStream,
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nsScriptObjectHolder &aResult);
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virtual nsresult DropScriptObject(void *object);
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virtual nsresult HoldScriptObject(void *object);
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virtual void EnterModalState();
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virtual void LeaveModalState();
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NS_DECL_NSIXPCSCRIPTNOTIFY
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static void LoadStart();
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static void LoadEnd();
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// CC does always call cycle collector and it also updates the counters
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// that MaybeCC uses.
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static void CC();
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// MaybeCC calls cycle collector if certain conditions are fulfilled.
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// The conditions are:
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// - The timer related to page load (sGCTimer) must not be active.
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// - At least NS_MIN_CC_INTERVAL milliseconds must have elapsed since the
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// previous cycle collector call.
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// - Certain number of MaybeCC calls have occurred.
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// The number of needed MaybeCC calls depends on the aHigherProbability
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// parameter. If the parameter is true, probability for calling cycle
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// collector rises increasingly. If the parameter is all the time false,
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// at least NS_MAX_DELAYED_CCOLLECT MaybeCC calls are needed.
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// If the previous call to cycle collector did collect something,
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// MaybeCC works effectively as if aHigherProbability was true.
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// @return PR_TRUE if cycle collector was called.
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static PRBool MaybeCC(PRBool aHigherProbability);
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// Calls CC() if user is currently inactive, otherwise MaybeCC(PR_TRUE)
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static void CCIfUserInactive();
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static void FireGCTimer(PRBool aLoadInProgress);
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protected:
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nsresult InitializeExternalClasses();
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// aHolder should be holding our global object
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nsresult FindXPCNativeWrapperClass(nsIXPConnectJSObjectHolder *aHolder);
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// Helper to convert xpcom datatypes to jsvals.
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JS_FORCES_STACK nsresult ConvertSupportsTojsvals(nsISupports *aArgs,
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void *aScope,
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PRUint32 *aArgc,
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void **aArgv,
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void **aMarkp);
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nsresult AddSupportsPrimitiveTojsvals(nsISupports *aArg, jsval *aArgv);
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// given an nsISupports object (presumably an event target or some other
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// DOM object), get (or create) the JSObject wrapping it.
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nsresult JSObjectFromInterface(nsISupports *aSup, void *aScript,
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JSObject **aRet);
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// Report the pending exception on our mContext, if any. This
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// function will set aside the frame chain on mContext before
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// reporting.
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void ReportPendingException();
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private:
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void DestroyJSContext();
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nsrefcnt GetCCRefcnt();
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JSContext *mContext;
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PRUint32 mNumEvaluations;
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protected:
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struct TerminationFuncHolder;
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friend struct TerminationFuncHolder;
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struct TerminationFuncClosure
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{
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TerminationFuncClosure(nsScriptTerminationFunc aFunc,
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nsISupports* aArg,
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TerminationFuncClosure* aNext) :
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mTerminationFunc(aFunc),
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mTerminationFuncArg(aArg),
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mNext(aNext)
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{
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}
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~TerminationFuncClosure()
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{
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delete mNext;
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}
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nsScriptTerminationFunc mTerminationFunc;
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nsCOMPtr<nsISupports> mTerminationFuncArg;
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TerminationFuncClosure* mNext;
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};
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struct TerminationFuncHolder
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{
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TerminationFuncHolder(nsJSContext* aContext)
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: mContext(aContext),
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mTerminations(aContext->mTerminations)
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{
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aContext->mTerminations = nsnull;
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}
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~TerminationFuncHolder()
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{
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// Have to be careful here. mContext might have picked up new
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// termination funcs while the script was evaluating. Prepend whatever
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// we have to the current termination funcs on the context (since our
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// termination funcs were posted first).
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if (mTerminations) {
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TerminationFuncClosure* cur = mTerminations;
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while (cur->mNext) {
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cur = cur->mNext;
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}
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cur->mNext = mContext->mTerminations;
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mContext->mTerminations = mTerminations;
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}
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}
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nsJSContext* mContext;
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TerminationFuncClosure* mTerminations;
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};
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TerminationFuncClosure* mTerminations;
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private:
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PRPackedBool mIsInitialized;
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PRPackedBool mScriptsEnabled;
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PRPackedBool mGCOnDestruction;
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PRPackedBool mProcessingScriptTag;
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PRUint32 mDefaultJSOptions;
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PRTime mOperationCallbackTime;
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PRTime mModalStateTime;
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PRUint32 mModalStateDepth;
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// mGlobalWrapperRef is used only to hold a strong reference to the
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// global object wrapper while the nsJSContext is alive. This cuts
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// down on the number of rooting and unrooting calls XPConnect has
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// to make when the global object is touched in JS.
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nsCOMPtr<nsISupports> mGlobalWrapperRef;
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static int JSOptionChangedCallback(const char *pref, void *data);
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static JSBool DOMOperationCallback(JSContext *cx);
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};
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class nsIJSRuntimeService;
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class nsJSRuntime : public nsIScriptRuntime
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{
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public:
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// let people who can see us use our runtime for convenience.
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static JSRuntime *sRuntime;
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public:
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// nsISupports
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NS_DECL_ISUPPORTS
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virtual PRUint32 GetScriptTypeID() {
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return nsIProgrammingLanguage::JAVASCRIPT;
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}
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virtual nsresult CreateContext(nsIScriptContext **ret);
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virtual nsresult ParseVersion(const nsString &aVersionStr, PRUint32 *flags);
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virtual nsresult DropScriptObject(void *object);
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virtual nsresult HoldScriptObject(void *object);
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static void Startup();
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static void Shutdown();
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// Setup all the statics etc - safe to call multiple times after Startup()
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static nsresult Init();
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// Get the NameSpaceManager, creating if necessary
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static nsScriptNameSpaceManager* GetNameSpaceManager();
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};
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// An interface for fast and native conversion to/from nsIArray. If an object
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// supports this interface, JS can reach directly in for the argv, and avoid
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// nsISupports conversion. If this interface is not supported, the object will
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// be queried for nsIArray, and everything converted via xpcom objects.
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#define NS_IJSARGARRAY_IID \
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{ /*{E96FB2AE-CB4F-44a0-81F8-D91C80AFE9A3} */ \
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0xe96fb2ae, 0xcb4f, 0x44a0, \
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{ 0x81, 0xf8, 0xd9, 0x1c, 0x80, 0xaf, 0xe9, 0xa3 } }
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class nsIJSArgArray: public nsISupports
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IJSARGARRAY_IID)
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// Bug 312003 describes why this must be "void **", but after calling argv
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// may be cast to jsval* and the args found at:
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// ((jsval*)argv)[0], ..., ((jsval*)argv)[argc - 1]
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virtual nsresult GetArgs(PRUint32 *argc, void **argv) = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSArgArray, NS_IJSARGARRAY_IID)
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/* factory functions */
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nsresult NS_CreateJSRuntime(nsIScriptRuntime **aRuntime);
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/* prototypes */
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void NS_ScriptErrorReporter(JSContext *cx, const char *message, JSErrorReport *report);
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#endif /* nsJSEnvironment_h___ */
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